Preserve text in ambiguous table rows

[Neel49]

Summary

• Preserve all source text when a row has more cells than its inferred table columns.
• Use the existing GridFallback instead of dropping unmatched cells.
• Add regression coverage for nested label/value panels.

Testing

• cargo fmt --all -- --check
• cargo clippy --all-targets
• cargo test -p liteparse

[Neel49]

@codex review

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[logan-markewich]

Hey thanks @Neel49 -- can you try the latest 2.13.1 release? I made a similar fix in #420